/Engine/Plugins/Runtime/RigVM/Source/RigVM/Public/RigVMCore/RigVMTemplate.h
Returns the index of the permutation within the template of a given function (or INDEX_NONE)
int32 FindPermutation ( const [FRigVMFunction](API\Plugins\RigVM\RigVMCore\FRigVMFunction) * InPermutation ) const